Hall Effect Sensor 49E Hall sensor OH49E S49E Hall element SS49E linear Hall switch plug-in TO-92S


Output low current IOL : 50mA
Storage temperature range TS : -65 ~ 150°C
Power supply voltage: VCC 4 to 24V;
Output breakdown voltage: Vce 50V
Operating temperature TA : E :-20 ~ 85°C, L:-40 ~ 150°C
Model: 49E, OH49E, S49E, SS49E
Terminals Number: 3
Terminals Length:15mm/0.59inch


Senses relative strength of magnetic field and provides analog voltage output
Can differentiate between North and South pole of magnet
3.3 and 5V compatible


Hall-effect sensors are commonly used for measuring the speed of rotating assemblies where a magnet on the assembly alternately makes and breaks magnetic contact with the sensor as the assembly rotates.  They can also be used for applications such as determining when a door has been opened, position sensing and detecting the magnetic field created by current flow in a wire.


The 49E sensor can detect both the North and South pole of a magnet as well as the relative strength of the magnetic field.  The side of the sensor with the labeling is the side used for detection.


Hall-effect sensors have several advantages over mechanic switches, chief among them are that by being solid-state, there is no concern about contacts wearing out and the switching speed can be quite high.


The main challenge with using Hall-effect sensors usually resides around the mounting of the sensor and any associated magnets.


Working
When there is no magnetic field present, the output of the sensor stands at approximately 50% of Vcc. So, with 5V power, the output will be about 2.5V. When a magnet is there, the voltage rises or falls depending on whether the south or north pole of the magnet is coming near.  If we place a south pole of a magnet near the front of the sensor, the output voltage will linearly slope up towards VCC to a maximum of 4.2V. If we place a north pole of a magnet near the front of the sensor, the voltage will linearly ramp down towards the ground to a minimum of 0.86V. Hence, the amount of voltage that increases or decreases depends on the magnetic strength of the field.


Typical Applications:
throttle
Motor control
Magnetic code reading
Ferrous metal detector
Current sensing
Position sensing